Anchor for concrete work.



A. 1; LOHMANN. ANCHOR FOR CONCRETE WORK. v APPLIOATON FILED DB0. 23, 1913.4

mmm@ Patena sept. 15,1914, 4

NWNTRM nivrrnn srarns ALFRED P. LoHMAnN, 'or AKRON, oHIo.

Aivonoit son Aeonenn'ri: ivoren.

miesen.

Specification ef Letters Patent.

y Patented Sept. 1.5, 1.91.4.

Application filed December 23, 1913. Serial No. 808,311.

To all whom it may concern Beit known that I, ALFRED P. Loi-IMANN,

a citizen of the United States, residing at kromin the county ot' Summit and State of Ohio, have invented ne1 and useful Im.

rovements in Anchors for Concrete Work of whif'ah'the following is a specification.

This invention relates to improvements in anchoringfdevices adapted to be' embedded in cemen'titious structures, such 'for 1nstance concrete, and is of the general type shown inU. S; Letters Patent to me March 1, 1913, No. 950,711.

The primary object of this invention is tof so form the device .that its engagementwith the body of the material in which it is inclosedgwill be more effectual than the type of device shown in my patent herctofore'referred` ton i further. object is to so construct the device as .to permit the placement of transverse and longitudinal reinforcing bars in the cementitious material without interference with-the anchor and also so constituted that the anchor itself will serve as a supL porting medium, if desired, for the reinforcing barsor rods in the concrete for holding them in spaced relation with respect to the form in `which the concrete is placed.

l/Vith the foregoing and other objects in View, the invention consists in the novel construction, combination and .arrangement of parts constituting the invention to be herematter specifically described and illustrated i in the accompanying drawings which form a part hercoi2 wherein is shown the preferred embodiment of the invention, but it is to be understood that changes, variations and modifications can be resorted to which come within the scope of the matter hereinafter' claimed.

1n thefdrawings in which similar. reference numerals indicate like parts in the dif- `ferent figures, Figure 1, is a perspective view ot' ananehor embodying this invention; Fig. 2, is a view in side elevation' of the device shown .in Fig. 1; Figu, is a section of a concrete stru eture with my improved anchor positioned' therein, the section being taken transversely of the longitudinal line of the anchor; and, Fig. 4, is a' perspective view of s a. member commonly employed in Connection with the' anchor.

Referring more particularly tothe drawings the reference numeral 1 denotes the body of the anchor which is preferably in the torni of an inverted frustum of an elongated pyramid. with inwardly and downwardly sloping exterior walls 2 and with the inner faces 3 thereof inwardly inclined and usually approximately parallel with the outer walls 2.

The side walls 2 are provided with lugs y4, 5 and 6 on each side, the lugs on each side being spaced from .each other to provide notches 7 through which nails or other holdfast devices are passed for holding the lower face of the body 1 against one of the walls of the form in'which is placed the concrete. `The body 1 being hollow provides an interior recess 8 the edges 9 of which are adapted=to lie approximately Hush with the inner ffice 10 of the cementitiousv structure 11. The body portion is adapted to be placed in vthe `cementitious structure While it is in al plastic condition and as the structure hardens it becomes firmly embedded and is thereby anchorcd. Positionedwithin the recess 8 is a member 12 preferably in the form of an inverted frustum of a pyramid provided with an aperture 13 through which is passed a supporting rod 14. Any' structure, such for instance, as a gas pipe or shaft, is secured tothe supporting medium 14 and the wedging action developed by engagement of the structure with the wall causes the member 12 to Wedge itself accurately in position against the inclined inner faces in. the body 1.

The device so .tar described isto all intents andv purposes approximately identical with that shown and described'in my patent hereinbefore referred to.

Extending upwardly from opposite the ends 15 vand 16.0.1c the body portion 1 and preferably on opposite sides thereof are a pair oit-prongs or anchoring members 17. These members 17 preferably extend later` ally beyond the normal outlines of the side edges 2 of the body 1 and are preferably inwardly-b'ent to provide hooked ends 18 its the members 17 project laterally and' the points 20 thereof extend beyond the riormal outlines of the body 1 they thereby increase the area or width of the breaking lines of concrete, which are usually at an angle of 45 with respect to the vertical line of the body, and these breaking lines are indicated by thedotted lines 21 in Fig. 3, so that by so forming` themembers 17 as shown, the area covered is greater than the body 1 of the anchor, and hence, a better `grip or bond is formed with respect to the concrete and the anchorage thus secured is capable of sustaining a greater load.

In Fig. 3, wherein the view is taken in section transversely of the median line of the anchor, one member 17 is shown in heavy dotted lines, and the position of the opposite member 17, which is removed vby reason of the section, is indicated by light'dotted lines 22, solely to show its relation with respect to the heavy dotted lines of the member 17.

Aside from the superior amount of anchorage obtained by a device of this character, the positioning of the members 17 at opposite ends of the body 1 permits the placement of transverse reinforcing bars 23 in the material without interfering' with the anchor body 1. Longitudinalreinforcing bars 24 may be also placed in the con* crete without any interference with the body 1.

Customarlly, in placing bars in reinforc! ing concrete structures, the bars are placed where the stress occurs, land as necessity compels their placement they have seriously interfered `with the embedding of anchors of this general type in the concrete for the reason that the anchors afl'ord anobstruction to the placement of the barsr But in this construction the anchor may be placed anywhere desired, such for instance, as centrally on a beam, and the reinforcing rod or bar in the concrete may be placed immediately` over the anchor and passed between the two prongs 17 thereof either transversely or longitudinally of the anchor body.

Usually in preparing concrete beams or structures, means must be provided for supporting the strengthening rods embedded therein during the pouring or placement of the concrete material, andI the means employed must be sufiiciently strong to firmly hold the rods against displacement by the mass of material poured into the form, and

hence, if desired, the anchors are securedA to the form by hold-fast devices passed through the notches 7 and the' reinforcing bars are laid either transversely or longitudinally on top of the anchorswhieh serve to support the rods or bars during the placement of the concrete. After the removal of the forms, the projecting hold-fast devices which have been passed through the notches 7 are cut off and the under face of the anchors are flush with the concrete structure, as shown in Fig. 3. y

It will be noted that the body portion when positioned and supporting a reinforcing bar in the concrete constituting a supporting element for this purpose irrespective of whether the bars are extended longitudinally or transverse'with respect to the body portion, and hence, for convenience of description, the device constitutes a chair for performing this function.

1. An anchoring device for the purpose set forth comprising a bodyp ortion adapt-- ed to be secured in a concrete structure and with its lower face approximately-flush' with the face of the wall of said structure, said body portion provided with a pair of upwardly and outwardly-projecting prongs positioned on opposite sides of said body por tion and at opposite ends, said prongs projecting' outwardly both laterally and longitudinally beyond the normal outlines of said body. I

2. An anchoring device for use in connection with concrete structures comprising a body portion adaptedl to be positioned-1in a structural self-hardening material With one face thereof approximately flush4 with the surface of said material, said face provided with a recess extending in said body portion and with the faces adjacent to the opening thereof inclined to constitute a seat for a shiftahle member, a member with the sides thereof each provided with inclined faces at an angle to each other,- whereby said member may be seated on the inclined faces of said recess, said body portion filrther provided with a pair of upwardly and outwardly-projectingJ prongs positioned on the opposite sides of said body portion and at opposite ends thereof, said prongs projecting outwardly both laterally and longitudinally beyond the normal outline of said body portion.

3. An anchoring device for the purpose set forth comprising a body portion provided with a recess in its lower face, the

side walls of said recess inclining toward the lower face of the body portion and also f supporting an object, said body portion fur- In testimony lwhereof have hereunto set ther-more provided at its upper portion my hand in presence of two subscribing lo with :L pair of upwardly and outwardly-pro` Witnesses.

jeeting pron-gs positioned on op osite sides y T of said body portion and. at opEposite ends ALFRED P MOHMANN' thereof, said prongs projecting outwardly lVitnesses:

both laterally and longitudinally beyond the A. L. MCCLINTOCK,

normal outlines of said body portion. C. E. HUMPHREY. 

